WebUI: Fix changing category on HBAC/Sudo/etc Rule pages
No object can be added to a rule when object category is 'all'.
So while editing rule there is needed to save actual category value
before adding related objects.
Ticket: https://pagure.io/freeipa/issue/7961
Signed-off-by: Serhii Tsymbaliuk <stsymbal@redhat.com>
Reviewed-By: Armando Neto <abiagion@redhat.com>